EP1627931B1 - Seamless steel tube which is intended to be used as a guide pipe and production method thereof - Google Patents

Seamless steel tube which is intended to be used as a guide pipe and production method thereof Download PDF

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Publication number
EP1627931B1
EP1627931B1 EP03816794.6A EP03816794A EP1627931B1 EP 1627931 B1 EP1627931 B1 EP 1627931B1 EP 03816794 A EP03816794 A EP 03816794A EP 1627931 B1 EP1627931 B1 EP 1627931B1
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EP
European Patent Office
Prior art keywords
good
resistance
max
cracking
metal base
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Expired - Fee Related
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EP03816794.6A
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German (de)
English (en)
French (fr)
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EP1627931A1 (en
Inventor
Marco Mario Tivelli
Alfonso Izquierdo Garcia
Dionino Colleluori
Guiseppe CUMINO
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Dalmine SpA
Tubos de Acero de Mexico SA
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Dalmine SpA
Tubos de Acero de Mexico SA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Definitions

  • the present invention refers to steel with good mechanical strength, good toughness and which is corrosion resistant, more specifically to heavy gauge seamless steel tubing, with good mechanical strength, good toughness to prevent cracking in the metal base as well as in the heat affected zone, and corrosion resistant, called conduit, of catenary configuration, to be used as a conduit for fluids at high temperatures, preferably up to 130 °C and high pressure, preferably up to 680 atm and a method for manufacturing said tubing.
  • conduits of catenary configuration commonly known in the oil industry as Steel Catenary Risers
  • These conduits are placed at the upper part of the underwater structure, that is, between the water surface and the first point at which the structure touches the sea bed and in only part of the complete conduction system.
  • This canalization system is essentially made up of conduit tubes, which serve to carry the fluids from the ocean floor to the ocean surface. At present, this tubing is made of steel and is generally joined together through welding.
  • a conduit system such as the one described above is exposed to the undulating movements of the waves and the ocean currents. Therefore, the resistance to fatigue is a very important property in this type of tubing, making the phenomena of the welded connections of the tubing a critical one. Therefore, restrictred dimensional tolerances, mechanical properties of uniform resistance and high tenacity to prevent cracking in the metal base as well as in the heat affected zone, are the principal characteristics of this kind of tubing.
  • the fluid which circulates within the conduit may contain H 2 S, making it also necessary for the product to be highly resistant to corrosion.
  • Another important factor that should be taken into account is that the fluid which will be carried by the conduit is very hot, making it necessary for the tubes that make up the system to maintain their properties at high temperatures.
  • the medium in which the tubes must sometimes operate implies maintaining its operability even at very low temperatures. Many of the deposits are located at latitudes with very low temperatures, making it necessary for the tubing to maintain its mechanical properties even at these temperatures.
  • a common practice used to increase the resistance of a steel product is to add alloying elements such as C and Mn, to carry out a thermal treatment of hardening and tempering and to add elements which generate hardening through precipitation such as Nb and V.
  • alloying elements such as C and Mn
  • the type of steel products such as conduits, not only require high resistance and toughness, but also other properties such as high resistance to corrosion, and high resistance to cracking in the metal base as well as in the heat affected zone once the tubing has been welded.
  • Conduits are tubes that, like conduit tubing, carry a liquid, a gas or both. Said tubing is manufactured under norms, standards, specifications and codes which govern the manufacturing of conduction tubes is most cases. Additionally, this tubing characterized and differentiated from the majority of standard conduction tube in terms of the range of chemical composition, the range of restricted mechanical properties (yielding, stress resistance and their relationship), low hardness, high toughness, dimensional tolerances restricted by the interior diameter and criteria of severe inspection.
  • Still another more complex problem is the manufacturing of heavy gauge tubing which fulfills the correct balance of properties required for its performance as a conduits.
  • Document EP0954617 B1 discloses a method of producing seamless tubes of a quality grade ranging from X52 to X90, exhibiting yield point stability combined with constant stress-strain characteristics up to a service temperature of 200°C.
  • the document EP 1 182 268 of MIYATA Yukio and associates discloses an alloy of steel used for manufacturing conduction or conduit tubing.
  • Mn improves the toughness of the material, in the base material as well as in the welding heat affected zone. This affirmation is also incorrect, since Mn is an element which increases the hardenability of steel, thus promoting the formation of martensite, as well as promoting the constituent MA, which is a detriment toughness. Mn promotes high central segregation in the steel bar from which tubing is made, even more in the presence of P. Mn is the element with the second highest index of segregation, and promotes the formation of MnS inclusions, and even when steel is treated with Ca, due to the problem of central segregation of Mn above 1.35%, said inclusions are not eliminated.
  • Mn is the element with the second most influence on the formula CE (Carbon equivalent, formula 11W) with which the value of the content of final CE increases.
  • High contents of CE imply welding problems with the material in terms of hardness.
  • additives of up to 0.1% of V allow for the obtaining of sufficient resistance for this grade of heavy gauge tubes, although it is impossible to also obtain at the same time high toughness.
  • the main objective of this invention is to provide a chemical composition for steel to be used in the manufacturing of seamless steel tube and a process for manufacturing which leads to a product with high mechanical resistance at room temperature and up to 130°C, high toughness, low hardenability, resistance to corrosion in mediums which contain H 2 S and high values of tenacity in terms of resistance to the advancing of fissures in the HAZ evaluated by the CTOD test (Crack Tip Opening Displacement).
  • Still another objective is to make possible a product which possesses an acceptable balance of the above mentioned qualities and which complies with the requirements which a conduit for carrying fluids under high pressure, that is, above 680 atm, should have.
  • Still another objective is to make possible a product which possesses a good degree of resistance to high temperatures.
  • a fourth objective is to provide a heat treatment to which a seamless tube would be submitted which promotes the obtaining of the necessary mechanical properties and resistance to corrosion.
  • the present invention consists of, in one of its aspects, mechanical steel, highly resistant to temperatures from room temperature to 130 °C with good toughness and low hardenability which also is highly resistant to corrosion and cracking in HAZ once the tube is welded to another tube to be used in the manufacturing of steel tubing which complies with underwater conduit systems.
  • Another aspect of this invention is a method for manufacturing this type of tubing. With respect to the method, first an alloy is manufactured with the desired chemical composition.
  • This steel consists by weight percentages of the following elements: C 0.06 to 0.13; Mn 1.00 to 1.30; Si 0.35 max.; P 0.015 max.; S 0.003 max.; Mo 0.10 to 0.20; Cr 0.10 to 0.30; V 0.050 to 0.10; Nb 0.020 to 0.035; Ni 0.30 to 0.45; Al 0.015 to 0.040; Ti 0.020 max.; Cu 0.2 max. and N 0.010 max., the rest Fe and inevitable impurities.
  • the aforementioned elements should satisfy the following relationships: 0.5 ⁇ Mo + Cr + Ni ⁇ 1 Mo + Cr + V / 5 + Ni + Cu / 15 ⁇ 0.14
  • the gauge of the walls of the tubes should be established in the range of ⁇ 30 mm.
  • the steel tube is subjected to a thermal hardening and tempering treatment to bestow it with a microstructure and final properties.
  • the steel identified in Figure 2 with the number 1 possesses 0.001% Ti and has been austenitized at 920 °C and tempered at 630 °C.
  • This steel contains the chemical composition A, indicated in Table 2.
  • Steel 17 (with chemical composition E) contains a larger amount of Ti (0.015%) and has been heat treated under the same conditions as the previously mentioned steel.
  • alloys A, B, C, D, E, F and G have also been treated with other austenitizing and tempering temperatures, as indicated in Figure 3 .
  • the inventor has discovered that the combination of elements such as Nb-V-Mo-Ni-Cr among others, in predetermined amounts, leads to the obtaining of an excellent combination of stress resistance, toughness, hardenability, high levels of CTOD and good resistance to hydrogen induced cracking (HIC) in a metal base, as well as leading to the obtaining of high levels of CTOD in the heat affected zone (HAZ) of the welded joint.
  • elements such as Nb-V-Mo-Ni-Cr among others, in predetermined amounts, leads to the obtaining of an excellent combination of stress resistance, toughness, hardenability, high levels of CTOD and good resistance to hydrogen induced cracking (HIC) in a metal base, as well as leading to the obtaining of high levels of CTOD in the heat affected zone (HAZ) of the welded joint.
  • Step B The next step was to reduce the content of C to 0.061% (Steel B), observing that there was detriment to both values that were evaluated.
  • Step C we started with Steel A, and V was eliminated from the composition (Steel C). In this case, the transition temperature improves slightly, but the Ultimate Tensile Strength of the material did not reach the minimum requirement.
  • the inventor has carried out other series of experiments to test three important factors which may affect the properties of the material used for the conduit: the content of Ti in an alloy, the effect of the size of the austenitic grain and the tempering temperature during the thermal treatment of the steel.
  • the inventor discovered that the variation in the tempering temperature of steel by approximately 30 °C produced no significant effect on the mechanical properties of the material, in the case of the alloy which did not contain Ti. However, in an alloy with a content of Ti of up to 0.015%, a lowering in the resistance was found when the tempering temperature was increased from 630 °C to 660 °C.
  • Carbon is the most economical element and that with the greatest impact on the mechanical resistance of steel, thus the percentage of its content cannot be too low. In order to obtain yielding strength ⁇ 65 ksi (448.2 MPa), it is necessary that the content of carbon be above 0.6% for heavy gauge tubes.
  • C is the main element which promotes the hardenability of the material. If the percentage of C is too low, the hardenability of the steel is affected considerably and thus the tendency of the formation of a coarse acicular structure in the half-value layer of the tube will be characteristic. This phenomenon will lead to a less than desirable resistance for the material as well as resulting in detriment to the toughness.
  • the content of C should not be above 0.13% in order to avoid a high degree of high productivity and low thermal hardening in the welding in the joint between one tube and another, and to avoid that the testing values of CTOD (carried out according to the ASTM norm E 1290) in the metal base exceed 0.8 mm at up to - 40 °C and to avoid that they exceed 0.5 mm at up to 0 C in the HAZ. Therefore, the amount of C should be between 0.06 and 0.13%.
  • Mn is an element which increases the hardenability of steel, promoting the formation of martensite as well as promoting the constituent MA, which is detrimental to the toughness. Mn promotes a high central segregation in the steel bar from which the tube is laminated. Also, Mn is the element with the second highest index of segregation, promoting the formation of MnS inclusions and even when the steel is treated with Ca, due to the problem of central segregation due to the amount of Mn above 1.35%, said inclusions are not eliminated.
  • Mn is the second most important element influencing the formula of CE (Carbon equivalent, Formula IIW) with which the end CE value is increased.
  • a mininum of 1.00% of Mn must be insured and a combination with C in the ranges previously mentioned, will guarantee the necessary hardenability of the material in order to meet the resistant requirements.
  • the optimum content of Mn should be in the range of 1.00 to 1.35 and, more specifically, should be in the range of 1.05 to 1.30%.
  • Silicon is necessary in the process of steel manufacturing as a desoxidant and is also necessary to better stress resistance in the material.
  • This element like manganese, promotes the segregation of P to the boundaries of the grain; therefore, it proves harmful and should be kept at the lowest possible level, preferably below 0.35% by weight.
  • Phosphorus is an inevitable element in metallic load, and an amount above 0.015% produces segregation on the boundaries of the grain, which lowers the resistance to HIC. It is imperative to keep the levels below 0.015% in order to avoid problems of toughness as well as hydrogen induced cracking.
  • Molybdenum allows for a rise in the tempering temperature, and also prevents the segregation of fragilizing elements on the boundaries of the austenitic grain. This element is also necessary for the improvement of the tempering of the material. It was discovered that the optimum minimal amount should be 0.1%. A maximum of 0.2% is established as an upper limit since above this amount, a decrease in the toughness of the body of the tube as well as in the heat affected zone of the welding is seen.
  • Chromium produces hardening through solid solution and increases the hardenability of the material, thus increasing its stress resistance.
  • Cr is an element which also is found in the chemical makeup. That is why it is necessary to have a minimum amount of 0.10% but, parallelly, an excess can cause problems of impairment. Therefore, it is recommendable to keep the maximum amount at 0.30%.
  • V 0.050 to 0.10
  • the minimum amount should be 0.050%. If the amount of this element exceeds 0.10% (and even if it exceeds 0.08%) the tensile strength of the welding can be affected due to an excess of carbides or carbonitrides in the mould. Therefore, the amount should be between 0.050 and 0.10%.
  • This element like V, precipitates in a solid solution in the form or carbides or nitrides thus increasing the material's resistance. Also, these carbides or nitrides deter excessive growth of the grain. An excess amount of this element has no advantages and actually could cause the precipitation of compounds which can prove harmful to the toughness. That is why the amount of Nb should be between 0.020 and 0.035.
  • Nickel is an element which increases the toughness of the base material and the welding, although excessive additions end up saturating this effect. Therefore, the optimum range for heavy gauge tubes should be 0.30 to 0.45%. It has been found that the optimum amount of Ni is 0.40%.
  • the amount of Cu should be kept below 0.2%.
  • Aluminum acts as a deoxidant in the steel manufacturing process. It also refines the grain of the material thus allowing for higher toughness values. On the other hand, a high Al content could generate alumina inclusions, thus decreasing the toughness of the material. Therefore, the amount of Aluminum should be limited to between 0.015 to 0.040%.
  • Ti is an element which is used for deoxidation and to refine grains. Amounts larger than 0.020% and in the presence of elements such as N and C may form compounds such as carbonitrides or nitrides of Ti which are detrimental to the transition temperature. As seen in Figure 2 , it was proven that in order to avoid a marked decrease in the transition temperature of the tube, the amount of Ti should be no greater than 0.02%.
  • the amount of N should be kept below 100 ppm in order to obtain steel with an amount of precipitates which do not decrease the toughness of the material.
  • the size of the optimum austenitic grain is from 9 to 10 according to ASTM.
  • the heavy gauge seamless steel tube containing the detailed chemical composition should have the following balance of characteristic values:
  • Another aspect of the present invention is that of disclosing the heat treatment suitable for use on a heavy gauge tube with the chemical composition indicated above, in order to obtain the mechanical properties and resistance to corrosion which are required.
  • the manufacturing process and, specifically, the parameters of the heat treatment together with the chemical composition described, have been developed by the inventor in order to obtain a suitable relationship of mechanical properties and corrosion resistance, at the same time obtaining high mechanical resistance of the material at 130 °C.
  • This steel is shaped into solid bards obtained through curved or vertical continuous casting. Next, the perforation of the bar and its posterior lamination takes place ending with the product in its final dimensions.
  • the preferred lamination process should be by still mandrel.
  • the tube is conformed, it is subjected to heat treatment.
  • the tube is first heated in an austenitic furnace to a temperature above austenitic temperature of between 900 °C and 930 °C is necessary.
  • This range has been developed to be sufficiently high as to obtain the correct dissolution of carbides in the matrix and, at the same time, not so high as to inhibit the excessive growth of the grain, which would later be detrimental to the transition temperature of the tube.
  • the tube exits the austenitic furnace it is immediately subjected to exterior-interior hardening in a tub where the hardening agent is water.
  • the hardening should take place in a tub which allows for the rotation of the tube while it is immersed in water, in order to obtain a homogeneous structure throughout the body of the tube preferentially.
  • an automatic alignment of the tube with respect to the injection nozzle of water also allows for better compliance with the planned objectives.
  • the next step is the tempering treatment of the tube, a process which assures the end microstructure. Said microstructure will give the product its mechanical and corrosion characteristics.
  • a high tempering temperature is effective in increasing the toughness of the material since it releases a significant amount of residual forces and places some constituents in the solution.
  • the tempering temperature should be between 630 °C and 690 °C.
  • the metallic load is prepared according to the concepts described and is cast in an electric arc furnace. During the fusion stage of the load at up to 1550 °C, dephosphorization of the steel takes place, next it is descaled and new scale is formed in order to somewhat reduce the sulfur content. Finally, it is decaburized to the desired levels and the liquid steel is emptied into the crevet.
  • the casting material is prepared in composition and temperature, it is sent to the continuous casting machine or the ingot casting where the transformation from liquid steel to solid bars of the desired diameter takes place.
  • the product obtained on completion of this process is ingots, bars or blossoms having the chemical composition described above.
  • the next step is the reheating of the steel blossoms to the temperature necessary for perforation and later lamination.
  • the master tube thus obtained is then adjusted to the final desired dimensions.
  • the steel tube is subjected to a hardening and tempering heat treatment in accordance with the parameters described in detail above.
  • Table 3 presents the different chemical compositions on which the tests used to consolidate this invention were based.
  • Table 4 establishes the effect of this composition, with heat treatments indicated, on the mechanical and anti-corrosion properties of the product.
  • This same tube possesses the properties indicated in the following columns for the same steel number as in Table 4, that is, a thickness of 35 mm, a yielding strength (YS) of 75 ksi (517.1 MPa), an ultimate tensile strength (UTS) of 89 ksi (613.6 MPa), a relation between the yielding strength and the ultimate tensile strength (YS/UTS) of 0.84, a yielding strength measured at 130 °C of 69 ksi (475.7 MPa), an ultimate tensile strength measured at 130 °C of 82 ksi (565.4 MPa), a relationship between the yielding strength and the ultimate tensile strength measured at 130 °C of 0.84, a resistance to cracking measured by the CTOD test at -10 °C of 1.37 mm, a measurement of absorbed energy measured by the Charpy test at -10 °C of 440 Joules, a ductile/brittle area of 100%, a hardness of 215 HV10

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
EP03816794.6A 2003-04-25 2003-04-25 Seamless steel tube which is intended to be used as a guide pipe and production method thereof Expired - Fee Related EP1627931B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/MX2003/000038 WO2004097059A1 (es) 2003-04-25 2003-04-25 Tubo de acero sin costura para ser utilizado como canalizador y proceso de obtencíon del mismo

Publications (2)

Publication Number Publication Date
EP1627931A1 EP1627931A1 (en) 2006-02-22
EP1627931B1 true EP1627931B1 (en) 2017-05-31

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EP03816794.6A Expired - Fee Related EP1627931B1 (en) 2003-04-25 2003-04-25 Seamless steel tube which is intended to be used as a guide pipe and production method thereof

Country Status (9)

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US (1) US8002910B2 (zh)
EP (1) EP1627931B1 (zh)
CN (1) CN100545291C (zh)
AU (1) AU2003225402B2 (zh)
BR (1) BR0318308B1 (zh)
DK (1) DK1627931T3 (zh)
EA (1) EA008812B1 (zh)
NO (1) NO342666B1 (zh)
WO (1) WO2004097059A1 (zh)

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US20050076975A1 (en) * 2003-10-10 2005-04-14 Tenaris Connections A.G. Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same
US20060169368A1 (en) * 2004-10-05 2006-08-03 Tenaris Conncections A.G. (A Liechtenstein Corporation) Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same
MXPA05008339A (es) * 2005-08-04 2007-02-05 Tenaris Connections Ag Acero de alta resistencia para tubos de acero soldables y sin costura.
JP2009541589A (ja) * 2006-06-29 2009-11-26 テナリス・コネクシヨンズ・アクチエンゲゼルシヤフト 低温における等方じん性が向上した油圧シリンダー用継ぎ目なし精密鋼管およびこれを得る方法
CN100500917C (zh) * 2007-03-29 2009-06-17 攀钢集团成都钢铁有限责任公司 抗硫腐蚀钢的冶炼方法
MX2007004600A (es) * 2007-04-17 2008-12-01 Tubos De Acero De Mexico S A Un tubo sin costura para la aplicación como secciones verticales de work-over.
US7862667B2 (en) 2007-07-06 2011-01-04 Tenaris Connections Limited Steels for sour service environments
EP2192203B1 (en) * 2007-07-23 2018-11-21 Nippon Steel & Sumitomo Metal Corporation Steel pipes excellent in deformation characteristics and process for manufacturing the same
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